THE MOSSES OF ALASKA 303 



by the form of the leaves, and more particularly by its narrower costa 

 and its upper cells which are much larger and more distinct (10-12/1 

 instead of 6-8). 



TRICHOSTOMUM SITKANUM sp. nov. 

 (PL xiv, fig. i a ~ e .) 



Dioicum? Cespites densiusculi, superne virides, intus nigrescentes, 

 inferne terra obruti. Caulis 2-3 centim. altus, parum divisus, laxe 

 foliosus. Folia mollia, sicca cirrato-crispata, madore patula, inferiora 

 2.5-3 m illi m « longa, superiora majora, 4-4.5 millim. longa, e basi 

 longe subvaginante lineari-lanceolata, marginibus planis integris, costa 

 sat valida, basi circa no p. lata, in mucronem lutescentem breviter ex- 

 currente, cellulis basis subvaginantis rectangulis, hyalinis, 4-6 long, 

 quam lat., caeteris quadrato-hexagonis, 12-14// latis, valde papillosis. 

 Castera desunt. 



From Sitka (Trelease, 2370). 



The aspect, the form of leaves, the looser basal areolation and the 

 upper cells more papillose, easily distinguish this plant from T. cuspi- 

 datissimum Card. & Ther. It is more closely connected with T. 

 bambergeri Sch., but the latter has the costa shining on the back in 

 a dry state, and the hyaline cells of the base going up along the borders 

 of the leaf, as in Barbula tortuosa Web. & Mohr. 



Desmatodon latifolius Br. eur., fasc. 18-20, p. 5, pi. 1. 

 From Unalaska (J. M. Macoun). 



BARBULA BRACHYPODA sp. nov. 

 (PL xiv, figs. 3"-*.) 



Monoica, laxiuscule cespitosa, viridis. Caulis 5-10 millim. altus, 

 erectus, simplex furcatusve. Folia mollia, sicca erecta, madida erecto- 

 patentia, elliptica vel subspathulata, 2.5-3 millim. longa, 0.6-1 millim. 

 lata, late et breviter acuminata obtusa, subobtusa acutave, marginibus e 

 basi ad medium usque revolutis, deinde planis et pro more limbo lutes- 

 cente e 3—4 seriebus cellularum composito limbatis, costa angusta (lat. 

 50//.), paulo sub apice evanida, rete levi, in dimidio inferiore laxissimo 

 hyalino, cellulis rectangularibus, 66—88 fx longis, circa 22 latis, superne 

 valde chlorophylloso, cellulis inasqualibus quadrato-rotundatis vel brevis- 

 sime rectangulis, e costa ad margines sensim minoribus (majoribus 25 [± 

 longis, 16 latis, minoribus quadratis, 14//. latis). Flos masculus infra 

 femineum situs. Folia perichcetialia caulinis majora, acuminata, 

 intima angustissima. Capsula in pedicello brevi, crassiusculo, pallido, 



